CN105385920A - Heated and reinforced high-strength cast magnesium alloy and preparation method thereof - Google Patents
Heated and reinforced high-strength cast magnesium alloy and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C23/00—Alloys based on magnesium
- C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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Abstract
The invention provides a heated and reinforced high-strength cast magnesium alloy and a preparation method thereof. The alloy comprises the following components in percentage by weight: 8.0-10.0 of Zn, 1.0-5.0 of Al, 1.0-5.0 of Sn, 0.1-1.0 of Cu, 0.3-0.8 of Mn, 0.3-0.5 of Ca, and the balance of Mg and inevitable impurity elements. According to the high-strength cast magnesium alloy, under a room-temperature stretch test, the tensile strength reaches 320-350 MPa, and the yield strength reaches 220-260 MPa. A heat treatment process of the magnesium alloy comprises solution treatment by 4-8 hours at a temperature of 330-380 DEG C, air cooling, aging by 8-16 hours at a temperature of 150-220 DEG C and obtaining of the high-strength cast magnesium alloy. The heat treatment process of the alloy is simple and easy to realize; and the aging treatment can form a lot of nanoscale strengthening phases in an alloy structure, so that the alloy strength can be prominently improved. The alloy contains no such noble metal as rare earth, and is an alloy system with low cost and wide applicability.
Description
Technical field
The present invention relates to metallic substance field of magnesium alloy, particularly a kind of heat treatment reinforcement cast Mg alloy with high strength and preparation method thereof.
Background technology
As structural metallic materials the lightest in current practical application; magnesium alloy has many premium propertiess; as little in density, specific tenacity and the high and good electromagnetic shielding of specific rigidity and damping performance; " 21 century most development potentiality and the green engineering material of future " is described as by people; in the face of global energy dilemma and problem of environmental pollution, magnesium alloy presents good development prospect in many industrial circles.
At present, in the magnesium alloy component of existing application, more than 80% by casting, and main application fields is automotive industry.The business magnesium alloy trade mark that current usage quantity is larger mainly contains AM60, AZ91D, ZK61, AS31 and AE42 etc., mainly for the preparation of the normal elements that vehicle steering, panel board and gear box casing etc. are not high to requirement of strength.But along with improving constantly of trolley part field lightweight demand, the automobile load-bearing structural members such as damping tower, bogie also need by using magnesium alloy materials to reduce weight.And the intensity of the commercial foundry magnesium alloy used at present is lower, yield strength, lower than 200MPa, is not enough to the requirement of strength meeting supporting part.Therefore, exploitation has the cast magnesium alloys of high strength and technology of preparing is current focus.
The raising of magnesium alloy strength is mainly through alloy grain refinement, solution strengthening and Precipitation strengthening.Cast Mg alloy with high strength newly developed is at present mainly by adding the solid solution that produces after rare earth element and ageing strengthening effect improves alloy property, mainly contain Mg-Zn-Y-Nd-Zr series and Mg-Gd-Y-Zn-Zr series, after this type of casting alloy heat treatment reinforcement, tensile strength can reach 300MPa, and yield strength can reach 200MPa.But such alloy contains a large amount of rare earth element, and cost is high, be mainly used in aerospace and military industry field.
Therefore be necessary that the cast magnesium alloys of developing low-cost high strength has great importance and necessity to the Application Areas expanding magnesium alloy.
Summary of the invention
The invention provides a kind of cast Mg alloy with high strength and preparation method thereof, solve the problem that current cast magnesium alloys intensity is lower, described magnesium alloy is cast Mg alloy with high strength, obtains excellent mechanical property by casting and thermal treatment process.
For achieving the above object, the present invention adopts following technical proposals:
A kind of cast Mg alloy with high strength, each component of alloy and weight percent thereof are: Zn:8.0-10.0%, Al:1.0-5.0%, Sn:1.0-5.0%, Cu:0.1-1.0%, Mn:0.3-0.8%, Ca:0.3-0.5%, all the other are Mg and inevitable impurity element.
Preferably, each component of alloy and weight percent thereof are: Zn:8.0-9.0%, Al:1.0-3.0%, Sn:1.0-3.0%, Cu:0.1-0.5%, Mn:0.3-0.6%, Ca:0.3-0.4%, and all the other are Mg and inevitable impurity element.
Preferably, each component of alloy and weight percent thereof are: Zn:9.0-10.0%, Al:3.0-5.0%, Sn:3.0-5.0%, Cu:0.5-1.0%, Mn:0.6-0.8%, Ca:0.4-0.5%, and all the other are Mg and inevitable impurity element.
Preferably, described cast Mg alloy with high strength, manganese adds with the form of magnesium manganese master alloy, and calcium adds with the form of magnesium calcium master alloy, and zinc, aluminium, tin and copper add with the form of pure zinc, fine aluminium, pure tin, fine copper.
Preferably, described cast Mg alloy with high strength, under room temperature tensile test, strength of alloy >=320MPa, yield strength >=220MPa.
Present invention also offers the preparation method of above-mentioned cast Mg alloy with high strength, comprise the steps:
(1) first by pure magnesium at 150-200 DEG C of preheating 20-30 minute, and to dry;
(2) pure magnesium is melted under gas shield, after fusing when melt temperature is 700-720 DEG C, zinc, aluminium, tin, copper and manganese is added in melt, then be stirred to alloying element and dissolve in melt completely, melt is warming up to 730-750 DEG C, is cooled to 680-730 DEG C 730-750 DEG C of insulation after 20-30 minute;
(3) under gas shield, casting is carried out.
(4) alloy step (3) obtained is at 330-380 DEG C of solution treatment 6-12 hour, and air cooling, afterwards at 150-220 DEG C of timeliness 8-16 hour, obtains cast Mg alloy with high strength.
Preferably, the preparation method of described cast Mg alloy with high strength, during casting, castmethod adopts die casting, metal mold, sand mold casting or semicontinuous casting.
Beneficial effect of the present invention is as follows:
The invention provides that a kind of preparation technology is simple, low cost, be easy to the cast Mg alloy with high strength Alloy And Preparation Method that can be applied to trolley part promoted the use of.
1, described cast Mg alloy with high strength, under room temperature tensile test, strength of alloy reaches 320-350MPa, and yield strength reaches 220-260MPa.
2, in described high-strength magnesium alloy Zn constituent content be 8-12%, Zn content more than 8% after, the casting technique higher to the cooling rate such as die casting, metal mold, the ardent performance of alloy reduces, and reaching can application level; In alloy aging process, Zn element can form Mg-Zn strengthening phase in magnesium matrix, has significant ageing strengthening effect, and the Zn of high-content ensure that the precipitation of a large amount of strengthening phase in ag(e)ing process, and the lifting of alloy intensity has vital role.Adding of Al element can be played the effect of solution strengthening and improves the effect of fluidity of alloy melt by alloy; In alloy, Sn element has the effect of grain refining, solution strengthening and ageing strengthening, can effectively reduce the impact of the ardent property that alloy brings due to high Zn content simultaneously; Cu element can form GP district in alloy aging process, strengthens the ability of alloy aging strengthening; Mn element forms precipitated phase with Fe element in alloy melt, improves alloy corrosion resistance energy; Ca element can effectively put forward heavy alloyed burning-point and oxidation resistance in alloy melting and castingprocesses, reduces tissue oxygen inclusion content, improves alloy purity, has the effect of grain refining simultaneously.
3, the thermal treatment process of magnesium alloy of the present invention: at 330-380 DEG C of solution treatment 4-8 hour, air cooling, afterwards at 150-220 DEG C of timeliness 8-16 hour, obtains cast Mg alloy with high strength.Alloy heat treatment process is simply easy to realize, and ageing treatment can form the strengthening phase of a large amount of Nano grades in alloy structure, can significantly improve alloy strength.
4, not containing the noble metals such as rare earth in alloy, is a kind of low cost suitability alloy system widely.
Accompanying drawing explanation
Fig. 1 is embodiment 1 interalloy microstructure picture;
Fig. 2 is embodiment 2 interalloy tensile stress strain curve.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment 1:
Alloying constituent (weight fraction) is: 8.0%Zn, 3.0%Al, 2.0%Sn, 1.0%Cu, 0.5%Mn, 0.5%Ca, and all the other are Mg and inevitable impurity element.
(1) first by pure magnesium, pure zinc, fine aluminium, pure tin and magnesium manganese master alloy at 100-150 DEG C of preheating 20-30 minute, and to dry;
(2) pure magnesium is melted under gas shield, after fusing when melt temperature is 700-720 DEG C, pure zinc, fine aluminium, pure tin and magnesium manganese master alloy is added in melt, then be stirred to alloying element and dissolve in melt completely, melt is warming up to 730-750 DEG C insulation 20-30 minute, after be cooled to 680-730 DEG C;
(3) melt is steadily poured into permanent mold casting under gas shield shaping, obtains ingot casting.
(4) alloy step (3) obtained is 360 DEG C of solution treatment 12 hours, and air cooling, afterwards 200 DEG C of timeliness 16 hours, obtains cast Mg alloy with high strength.
The Mg-8Zn-3Al-2Sn-1Cu-0.5Mn-0.5Ca strength of alloy obtained is 336.5MPa, and yield strength is 223.8MPa.
As shown in Figure 1, from the Mg-8Zn-3Al-2Sn-1Cu-0.5Mn-0.5Ca alloy casting state microstructure picture that this example is obtained, can find out, under as cast condition, there is a large amount of bulks and latticed second-phase in alloy in tissue.
Enter shown in Fig. 2, from the tensile stress strain curve of Mg-8Zn-3Al-1Sn-1Cu-0.5Mn-0.5Ca alloy after ageing treatment that this example obtains, can find out that the tensile strength of this alloy sample is 336.5MPa, yield strength is 223.8MPa.
Embodiment 2:
Alloying constituent (weight fraction) is: 10.0%Zn, 1.0%Al, 1.0%Sn, 0.5%Cu, 0.5%Mn, 0.5%Ca, and all the other are Mg and inevitable impurity element.
(1) first by pure magnesium, pure zinc, fine aluminium, pure tin and magnesium manganese master alloy at 100-150 DEG C of preheating 20-30 minute, and to dry;
(2) pure magnesium is melted under gas shield, after fusing when melt temperature is 700-720 DEG C, pure zinc, fine aluminium, pure tin and magnesium manganese master alloy is added in melt, then be stirred to alloying element and dissolve in melt completely, melt is warming up to 730-750 DEG C insulation 20-30 minute, after be cooled to 680-730 DEG C;
(3) melt is steadily poured into permanent mold casting under gas shield shaping, obtains ingot casting.
(4) alloy step (3) obtained is 380 DEG C of solution treatment 10 hours, and air cooling, afterwards 175 DEG C of timeliness 16 hours, obtains cast Mg alloy with high strength.
The Mg-10Zn-1Al-1Sn-0.5Cu-0.5Mn-0.5Ca strength of alloy obtained is 331.5MPa, and yield strength is 241.5MPa.
Embodiment 3:
Alloying constituent (weight fraction) is: 9.0%Zn, 1.0%Al, 3.0%Sn, 0.5%Cu, 0.5%Mn, 0.3%Ca, and all the other are Mg and inevitable impurity element.
(1) first by pure magnesium, pure zinc, fine aluminium, pure tin and magnesium manganese master alloy at 100-150 DEG C of preheating 20-30 minute, and to dry;
(2) pure magnesium is melted under gas shield, after fusing when melt temperature is 700-720 DEG C, pure zinc, fine aluminium, pure tin and magnesium manganese master alloy is added in melt, then be stirred to alloying element and dissolve in melt completely, melt is warming up to 730-750 DEG C insulation 20-30 minute, after be cooled to 680-730 DEG C;
(3) melt is steadily poured into permanent mold casting under gas shield shaping, obtains ingot casting.
(4) alloy step (3) obtained is 360 DEG C of solution treatment 12 hours, and air cooling, afterwards 200 DEG C of timeliness 16 hours, obtains cast Mg alloy with high strength.
The Mg-9Zn-1Al-3Sn-0.5Cu-0.5Mn-0.3Ca strength of alloy obtained is 326.5MPa, and yield strength is 221.2MPa.
Embodiment 4
Example adopts the magnesium alloy semicontinuous casting blank (specification is: Φ 210mm, and length is greater than 5000mm) of embodiment 1, and after extruding, sheet material specification is: wide 150mm, thick 20mm, length is 3000mm, and internal diameter of the container is 205mm.
First magnesium alloy blank is carried out the Homogenization Treatments of 455 DEG C/5h+545 DEG C/15h, fast peeling after cooling; Then add hot-extrusion mold and container, its temperature is 450 DEG C, and put into container after then magnesium alloy blank being heated to 460 DEG C of insulation 2h, 3600 tons of horizontal (double action) oil hydraulics extrude, and extrusion ratio is 11; By extruding, vertical section optical microstructure can find out, in extrusion process, there occurs complete dynamic recrystallization, and crystal grain is tiny, grain-size is about 13.5 μm; Squeezing prod carries out Mechanics Performance Testing according to GB/T228-2002 after the process of 220 DEG C/20h isothermal aging, the results are shown in down:
Board dimension: 150mm × 20mm after extruding, strength of alloy 467MPa, yield strength > 387MPa, unit elongation > 4.29%.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (8)
1. a heat treatment reinforcement cast Mg alloy with high strength, it is characterized in that, the each component of alloy and weight percent thereof are: Zn:8.0-10.0%, Al:1.0-5.0%, Sn:1.0-5.0%, Cu:0.1-1.0%, Mn:0.3-0.8%, Ca:0.3-0.5%, all the other are Mg and inevitable impurity element.
2. magnesium alloy as claimed in claim 1, it is characterized in that, each component of alloy and weight percent thereof are: Zn:8.0-9.0%, Al:1.0-3.0%, Sn:1.0-3.0%, Cu:0.1-0.5%, Mn:0.3-0.6%, Ca:0.3-0.4%, all the other are Mg and inevitable impurity element.
3. magnesium alloy as claimed in claim 1, it is characterized in that, each component of alloy and weight percent thereof are: Zn:9.0-10.0%, Al:3.0-5.0%, Sn:3.0-5.0%, Cu:0.5-1.0%, Mn:0.6-0.8%, Ca:0.4-0.5%, all the other are Mg and inevitable impurity element.
4. cast Mg alloy with high strength according to claim 1, is characterized in that, manganese adds with the form of magnesium manganese master alloy, and calcium adds with the form of magnesium calcium master alloy, and zinc, aluminium, tin and copper add with the form of pure zinc, fine aluminium, pure tin, fine copper.
5. cast Mg alloy with high strength according to claim 1, is characterized in that, under room temperature tensile test, strength of alloy reaches 320-350MPa, and yield strength reaches 220-260MPa.
6. the preparation method of the cast Mg alloy with high strength described in any one of claim 1-5, is characterized in that, comprises the steps:
(1) first by pure magnesium at 150-200 DEG C of preheating 20-30 minute, and to dry;
(2) pure magnesium is melted under gas shield, after fusing when melt temperature is 700-720 DEG C, zinc, aluminium, tin, copper, magnesium manganese master alloy and magnesium calcium master alloy is added in melt, then be stirred to alloying element and dissolve in melt completely, melt is warming up to 730-750 DEG C, is cooled to 680-730 DEG C 730-750 DEG C of insulation after 20-30 minute;
(3) under gas shield, casting is carried out;
(4) alloy step (3) obtained is at 330-380 DEG C of solution treatment 6-12 hour, and air cooling, afterwards at 150-220 DEG C of timeliness 8-16 hour, obtains cast Mg alloy with high strength.
7. the preparation method of cast Mg alloy with high strength according to claim 4, is characterized in that, during casting, castmethod adopts die casting, metal mold, sand mold casting or semicontinuous casting.
8. the application of the magnesium alloy described in any one of claim 1-5 in preparation damping tower, bogie, thick alloy sheets.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107236885A (en) * | 2017-06-07 | 2017-10-10 | 四川理工学院 | A kind of non-rare earth high-strength wrought magnesium alloy and preparation method thereof |
| CN107267828A (en) * | 2017-05-26 | 2017-10-20 | 广西庆达汽车零部件有限公司 | A kind of preparation method of magnesium alloy |
| CN107365930A (en) * | 2017-08-04 | 2017-11-21 | 江苏中科亚美新材料有限公司 | A kind of preparation method of magnesium alloy |
| CN107937780A (en) * | 2017-11-23 | 2018-04-20 | 重庆科技学院 | A kind of high performance magnesium alloy board and preparation method |
| CN108179337A (en) * | 2017-12-25 | 2018-06-19 | 广东省材料与加工研究所 | The diecast magnesium alloy and its pressure casting method of a kind of high temperature creep-resisting |
| CN109072359A (en) * | 2017-02-27 | 2018-12-21 | 韩国机械研究院 | Aging strengthening model type high-strength magnesium alloy and preparation method thereof |
| CN110317985A (en) * | 2019-08-14 | 2019-10-11 | 湘潭大学 | A kind of high-strength and high-plasticity magnesium-zinc-tin-calcium-aluminium-manganese heat-resistant deforming magnesium alloy and preparation method thereof |
| CN113981259A (en) * | 2021-11-01 | 2022-01-28 | 吉林大学 | Novel magnesium-aluminum-tin-calcium alloy and preparation method thereof |
| CN114990401A (en) * | 2022-05-31 | 2022-09-02 | 重庆大学 | High-performance cast magnesium alloy and preparation method thereof |
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| CN109072359A (en) * | 2017-02-27 | 2018-12-21 | 韩国机械研究院 | Aging strengthening model type high-strength magnesium alloy and preparation method thereof |
| CN109072359B (en) * | 2017-02-27 | 2020-09-08 | 韩国机械研究院 | Aging heat treatment type high-strength magnesium alloy and preparation method thereof |
| CN107267828A (en) * | 2017-05-26 | 2017-10-20 | 广西庆达汽车零部件有限公司 | A kind of preparation method of magnesium alloy |
| CN107236885A (en) * | 2017-06-07 | 2017-10-10 | 四川理工学院 | A kind of non-rare earth high-strength wrought magnesium alloy and preparation method thereof |
| CN107236885B (en) * | 2017-06-07 | 2019-01-15 | 四川理工学院 | A kind of non-rare earth high-strength wrought magnesium alloy and preparation method thereof |
| CN107365930A (en) * | 2017-08-04 | 2017-11-21 | 江苏中科亚美新材料有限公司 | A kind of preparation method of magnesium alloy |
| CN107937780A (en) * | 2017-11-23 | 2018-04-20 | 重庆科技学院 | A kind of high performance magnesium alloy board and preparation method |
| CN108179337A (en) * | 2017-12-25 | 2018-06-19 | 广东省材料与加工研究所 | The diecast magnesium alloy and its pressure casting method of a kind of high temperature creep-resisting |
| CN108179337B (en) * | 2017-12-25 | 2019-04-23 | 广东省材料与加工研究所 | A kind of diecast magnesium alloy and its pressure casting method of high temperature creep-resisting |
| CN110317985A (en) * | 2019-08-14 | 2019-10-11 | 湘潭大学 | A kind of high-strength and high-plasticity magnesium-zinc-tin-calcium-aluminium-manganese heat-resistant deforming magnesium alloy and preparation method thereof |
| CN113981259A (en) * | 2021-11-01 | 2022-01-28 | 吉林大学 | Novel magnesium-aluminum-tin-calcium alloy and preparation method thereof |
| CN114990401A (en) * | 2022-05-31 | 2022-09-02 | 重庆大学 | High-performance cast magnesium alloy and preparation method thereof |
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